The chaotic situation early on in the disaster was also brought up by the Bar Federation, that the worker could have been involved in those efforts. Documentation and dosimeters were not accurately (or at all) implemented during the early months at Fukushima. The Bar Federation also made this comment (translated to English)

” Furthermore, TEPCO, for reasons to deny a causal relationship, only apply to the certification standards of the ministry workers’ compensation insufficient factual survey like this, a concrete basis to deny a causal relationship with the physician consultation can not take listening.”

It does bring up the issue of TEPCO stepping outside their role and expertise to make a statement that is a larger issue and needs impartial medical review to come to such a conclusion.
The Federation also brought up the ongoing concerns of worker safety at the plant and previous high worker exposure rates as reasons for much concern. A full investigation including the workers history and activities should be conducted to rebuild the workers potential dose rate should be conducted, per the Federation.

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